A man asked the Messenger of Allah ﷺ, "Which aspect of Islam is best?"He replied, "That you feed others and offer greetings of peace to those you know and those you do not know."
حدثنا قتيبة بن سعيد حدثنا الليث عن يزيد بن أبي حبيب عن أبي الخير
أن رجلا سأل رسول الله ﷺ أي الإسلام خير قال تطعم الطعام وتقرأ السلام على من عرفت ومن لم تعرف
Bukhari narrated it, in the Book of Faith, chapter "Spreading the greeting of peace is part of Islam," hadith 28, and Muslim narrated it, in the Book of Faith, chapter "Explaining the varying excellence of Islam and which of its matters is most excellent," hadith 39, from Qutaybah, with this wording. Hadith: